FS00: Error Account balance = 0 but open items exist in the account

Hi,

I'm changing the g/l account master data to "Open item management", tab Control data.

I'm getting the error:

"Account balance = 0 but open items exist in the account

Message no. FH190"

I cannot save, I would convert this account to "Open item management" but is not possible, how can I solve this issue ? 😔

Thanks

Best Regards